Question: Find the principal unit normal vector N for the the given space curve. r(t)=(1+t)i +(8+ln(sec(t))j -9k,(-pi/2) < t

Find the principal unit normal vector N for the the given space curve. r(t)=(1+t)i +(8+ln(sec(t))j -9k,(-pi/2)< t <(pi/2)

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